The blazon of Marin-Epagnier's coat-of-arms is: "Sable, a Lion rampant or langued and armed Gules".

The Iron Age archaeological site of La Tène is within Marin-Epagnier's communal boundaries. (See also La Tène culture.) La Tène is a village located at the eastern end of the Lake Neuchâtel (Lac de Neuchâtel), a lake in Switzerland. It is now a leisure area within the commune of Marin-Epagnier in Canton Neuchâtel. La Tène has a sandy beach, unique in Switzerland.